Every day the human stomach produces about 2 liters of hydrochloric acid.

The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, this means it is an irrational number. When written as a decimal it never repeats and never ends.

There are twice as many kangaroos in Australia as there are people. The kangaroo population is estimated at about 40 million.

AMAZING FACTS